- Add a new CONNECT global variable allowing to tell whether or not

a temporary file should be used for UPDATE/DELETE of file tables.
  Also use the "sorted" argument of index_init to help decide if
  sorting of positions must be done.
modified:
  storage/connect/checklvl.h
  storage/connect/connect.cc
  storage/connect/connect.h
  storage/connect/filamdbf.cpp
  storage/connect/filamfix.cpp
  storage/connect/filamfix.h
  storage/connect/filamtxt.cpp
  storage/connect/ha_connect.cc
  storage/connect/mysql-test/connect/r/part_table.result
  storage/connect/plgdbsem.h
  storage/connect/plgdbutl.cpp
  storage/connect/reldef.cpp
  storage/connect/tabdos.cpp
  storage/connect/tabdos.h
  storage/connect/tabfix.cpp
  storage/connect/tabfmt.cpp
  storage/connect/tabvct.cpp
  storage/connect/tabvct.h
  storage/connect/xindex.cpp

- Fix a bug in TDBASE::ColDB that caused some special columns not to
  be found in the column list and reallocated without their Value
  causing a crash of some queries.
modified:
  storage/connect/table.cpp

- Fix a bug causing RestoreNrec to be called before closing a table
  causing a wrong value given to Spos
modified:
  storage/connect/tabdos.cpp
  storage/connect/xindex.cpp

- Add a new CONNECT global variable connect_exact_info. Set to ON, it
  tells CONNECT to return exact record numbers on info queries. If OFF
  it just gives an estimate. In version 10.0.13 this was unconditionally
  ON and caused info queries on remote tables to be extremely long and
  was the subject of MDEV-6612.
modified:
  storage/connect/ha_connect.cc
  storage/connect/tabdos.cpp
  storage/connect/tabmysql.cpp
  storage/connect/tabodbc.cpp

storage/connect/tabfmt.cpp

@@ -66,7 +66,8 @@
 #define MAXCOL          200        /* Default max column nb in result  */
 #define TYPE_UNKNOWN     10        /* Must be greater than other types */
 
-extern "C" int trace;
+extern "C" int     trace;
+extern "C" USETEMP Use_Temp;
 
 /***********************************************************************/
 /* CSVColumns: constructs the result blocks containing the description */
@@ -441,7 +442,7 @@ PTDB CSVDEF::GetTable(PGLOBAL g, MODE mode)
   PTDBASE tdbp;
 
   if (Catfunc != FNC_COL) {
-    USETEMP tmp = PlgGetUser(g)->UseTemp;
+    USETEMP tmp = Use_Temp;
     bool    map = Mapped && mode != MODE_INSERT &&
                   !(tmp != TMP_NO && mode == MODE_UPDATE) &&
                   !(tmp == TMP_FORCE &&
@@ -479,6 +480,36 @@ PTDB CSVDEF::GetTable(PGLOBAL g, MODE mode)
 
     if (Multiple)
       tdbp = new(g) TDBMUL(tdbp);
+    else
+      /*****************************************************************/
+      /*  For block tables, get eventually saved optimization values.  */
+      /*****************************************************************/
+      if (tdbp->GetBlockValues(g)) {
+        PushWarning(g, tdbp);
+//      return NULL;          // causes a crash when deleting index
+      } else {
+        if (IsOptimized()) {
+          if (map) {
+            txfp = new(g) MBKFAM(this);
+          } else if (Compressed) {
+#if defined(ZIP_SUPPORT)
+            if (Compressed == 1)
+              txfp = new(g) ZBKFAM(this);
+            else {
+              txfp->SetBlkPos(To_Pos);
+              ((PZLBFAM)txfp)->SetOptimized(To_Pos != NULL);
+              } // endelse
+#else
+            sprintf(g->Message, MSG(NO_FEAT_SUPPORT), "ZIP");
+            return NULL;
+#endif
+          } else
+            txfp = new(g) BLKFAM(this);
+
+          ((PTDBDOS)tdbp)->SetTxfp(txfp);
+          } // endif Optimized
+
+      } // endelse
 
   } else
     tdbp = new(g)TDBCCL(this);
@@ -605,14 +636,12 @@ int TDBCSV::EstimatedLength(PGLOBAL g)
 
 #if 0
 /***********************************************************************/
-/*  CSV tables favor the use temporary files for Update.               */
+/*  CSV tables needs the use temporary files for Update.               */
 /***********************************************************************/
 bool TDBCSV::IsUsingTemp(PGLOBAL g)
   {
-  USETEMP usetemp = PlgGetUser(g)->UseTemp;
-
-  return (usetemp == TMP_YES || usetemp == TMP_FORCE ||
-         (usetemp == TMP_AUTO && Mode == MODE_UPDATE));
+  return (Use_Temp == TMP_YES || Use_Temp == TMP_FORCE ||
+         (Use_Temp == TMP_AUTO && Mode == MODE_UPDATE));
   } // end of IsUsingTemp
 #endif // 0  (Same as TDBDOS one)